Without being able to drive, I’ve always thought that blind people and our guide dogs—especially those of us who live in big cities—must walk more than the average person-and-dog team does.

A new wellness program at my workplace gave me a chance to prove it. I work part time at Easter Seals Headquarters in downtown Chicago, and in June they started a six-week “Walk For U, Go The Extra Mile” challenge. Every employee received a free pedometer to keep track of our progress for six weeks, and those of us who met the daily goal of 7,000 steps per day—a distance of 3.5 miles—throughout the entire six weeks would be entered into a drawing to win a six-month fitness club membership.

The human resources department realized I wouldn’t be able to read the number of steps I’d taken each day on my own, so they ordered a special talking pedometer for me—it said my results out loud. And so, I was on my way to prove my theory.

The list of requirements for people applying to train with a Seeing Eye dog says candidates need to be able to walk one or two miles a day. When you live in a city you can’t simply open a sliding glass patio door to let your guide dog out. When my Seeing Eye dog Whitney (a two-year-old Golden Retriever/Labrador Retriever cross) needs to “empty,” I take her down the street, around the corner and to her favorite tree. That’s 1,000 steps per trip, and that trip takes place at least four times a day. And for the rest of the day, well, running errands in a city is like using one big treadmill. Add the safety shortcuts Whitney and I take across busy city streets (rather than deal with traffic, we go down the subway stairs on one side of busy streets, traverse underneath, then come up the stairs on the other side) well, every El station is a StairMaster.The first two weeks of our experiment included one week of 100-degree temperatures in Chicago. We stayed inside with our air conditioner on more than usual, but hey, a girls gotta go. Even in that hot weather Whitney and I averaged 9,871 steps a day, and our steps per day increased when temperatures cooled down the next week.

Just when I’d started planning which new equipment Whitney and I would try out when we won the free health club membership grand prize from the Go The Extra Mile challenge, I pressed the button to hear the number of steps I’d taken so far that day, and, nothing. My talking pedometer stopped talking. I shook the thing and pressed the button. Nothing. I turned it upside-down and rightside-up again. Nothing. I stuck it in a bag of rice for a day. Nothing.

And so, what happened with the challenge? Well, human resources offered to buy me a new talking pedometer, but I told them not to bother. I have a new theory now: blind people and our guide dogs—especially those of us who live in big cities—walk so many steps that a talking pedometer can’t keep up with us.